Method and device for producing reduced iron briquettes
By controlling particle size distribution and temperature through crushing, screening, mixing, and reheating, the method and apparatus produce high-density, high-strength HBI, addressing the limitations of existing technologies and ensuring compliance with maritime transport standards.
EP4772657A1Pending Publication Date: 2026-07-08JFE STEEL CORP
Patent Information
- Authority / Receiving Office
- EP · EP
- Patent Type
- Applications
- Current Assignee / Owner
- JFE STEEL CORP
- Filing Date
- 2024-08-15
- Publication Date
- 2026-07-08
AI Technical Summary
Technical Problem
Existing methods for producing hot briquetted iron (HBI) do not adequately address achieving high density and strength, particularly when using lower-grade raw materials, posing risks during storage and long-distance transport.
Method used
A method involving controlled particle size distribution through crushing, screening, mixing, and reheating of reduced iron aggregates before hot briquetting, ensuring relationships of H A >H B and W A (1/2) HA and W B >2W A are satisfied, along with a production apparatus comprising facilities for these processes.
Benefits of technology
The method and apparatus enable the production of high-density HBI with improved strength, meeting maritime transport standards by optimizing particle size distribution and temperature conditions.
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Smart Images
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Abstract
Proposed is a method for producing a reduced iron briquette that can improve both the apparent density and strength thereof when briquetting reduced iron through hot briquetting. The method for producing a reduced iron briquette of the present invention includes, in performing hot briquetting on a reduced iron aggregate composed of pellet-shaped reduced iron containing an iron component, a step of controlling a particle size distribution of the reduced iron aggregate, and a step of performing hot briquetting on the reduced iron aggregate with the controlled particle size distribution. An apparatus for producing a reduced iron briquette of the present invention includes a reduced iron production facility that produces pellet-shaped reduced iron containing an iron component to form a reduced iron aggregate, a crushing facility that crushes the reduced iron aggregate, a classification facility that screens the crushed reduced iron aggregate, using a sieve having a plurality of sieve meshes, a mixing facility that mixes the reduced iron aggregate having a plurality of particle size levels, separated by the screening, to prevent uneven distribution of the particle sizes within a mold for hot briquetting, and a reheating facility that heats the mixed reduced iron aggregate to a briquetting temperature required for the hot briquetting.
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